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    <title>Document</title>
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<script>
    //匿名函数
    //1.
    (function(userName){
        alert("Hello,"+userName);
    })('王圆梦');

    //2.
    var add = function(a,b){
        return a+b;
    };
    var sum=add(1,2);
    alert(add(1,2));
</script>
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